Prepare batter
Beat eggs and sugar until light and fluffy. Add milk, oil, and vanilla.
Add dry ingredients
Sift in flour and baking powder. Mix gently.
Bake
Pour into a small pan and bake at 170°C (340°F) for 18–20 minutes.
Cool
Let cake cool completely, then cut into 2 layers.
Make frosting
Whip cream with sugar and vanilla until stiff peaks form.
Assemble
Spread cream between layers and cover the cake with a thin coat.
Decorate
Keep it minimal—simple messages or pastel designs.
🍯 Tips
Use a small mold (10–12 cm) for authentic size
Chill the cake before decorating for clean edges
Keep decorations simple for the classic bento style